She returned to the MET for three consecutive season for the LePage Ring and then reprised her world premiere roles in Tan Dun's Marco Polo with the Bergen National Opera and the International Festival of Norway. In the 2014/15 season, she made her Lyric Opera of Chicago debut in Miecyzslaw Weinberg's The Passenger and returned in the 2015/16 season for Marie in Wozzeck; in the spring of 2016 she was at the Teatro Carlo Felice di Genova for Salome.
Her world premieres include Tan Dun's Marco Polo in Munich, Hong Kong and Amsterdam (recorded for Sony Classics), and her debut with Hamburg opera in the world premiere of Zemlinsky's Konig Kandaules as Nyssia, which was televised on the Arte channel and recorded for the Capriccio label which she later reprised at the Teatro Colon and Köln Opera, and Stephen Albert's Treestone at Alice Tully Hall.
Notable appearances on the concert stage include a televised concert of Salome and Alban Berg Lieder with the Kölner Rundfunk Symphonie Orchester under the baton of Hans Vonk and Zemlinsky's "Lyric" Symphony with The Royal Flemish Orchestra.
Ms. Warren began her career in New York, where she appeared at the Metropolitan Opera as Gerhilde in Die Walküre under the baton of James Levine, and New York City Opera where in her first season she received Debut Artist of the Year Award.
A graduate in dance and theatre arts from Brigham Young University, Nina studied voice at Manhattan School of Music and the Opera Center at the Juilliard School. A native of southern California, she currently maintains residences near San Diego and in Germany with her husband and three children.